<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8" />
<title>控制div属性</title>
<style>
#outer{width:500px;margin:0 auto;padding:0;text-align:center;}
#div1{width:100px;height:100px;background:black;margin:10px auto;display:block;}
</style>
<script>
var changeStyle = function (elem, attr, value){
	elem.style[attr] = value
};
window.onload = function (){
	var oBtn = document.getElementsByTagName("input");
	var oDiv = document.getElementById("div1");
	var oAtt = ["width","height","background","display","display"];
	var oVal = ["200px","200px","red","none","block"];

	for (var i = 0; i < oBtn.length; i++){
		oBtn[i].index = i;
		oBtn[i].onclick = function (){
			this.index == oBtn.length - 1 && (oDiv.style.cssText = "");	//并不是赋值！！！！！！！！！！是当当前的索引值为最后一个时，执行后面的
			changeStyle(oDiv, oAtt[this.index], oVal[this.index])
		}	
	}
};
</script>
</head>
<body>
<div id="outer">
<input type="button" value="变宽" />
<input type="button" value="变高" />
<input type="button" value="变色" />
<input type="button" value="隐藏" />
<input type="button" value="重置" />
<div id="div1"></div>
<p>这个script非常有教育意义！！</p>
</div>
</body>
</html>
